vmware, subnet , site recovery manager

I have two sites, site A and site B
site A  - subnet 192.168.1.0/255.255.255.0
site B  - subnet 192.168.2.0/255.255.255.0

site A and site B are working together through VPN.

now my limitations are hard coded ip address with in application, site A servers are hard coded with site A ip ( 192.168.1.x)  and site B servers are hardcode with site B ip address ( 192.168.2.y), server name not a big issue the dns is able resovle to new ip address.

1) what is my best option to virtualizes them ? Continue the same way or change it ?
2) Due to hard coded ip address with in applications i cannot restore the site A server to site B or site B to site A, can i eliminate this limitation with VMware Site Recovery Manager ? or the hard coded ip still become an issue ?

need advise from experts - Thanks.
ThushyaAsked:
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vmwarun - ArunCommented:
1.How big is the enviroment in both sites ? Do they run the same number of applications and servers ?
2.Are you using Active Directory ?
3.List out the applications are you using in your infrastructure.
4.Are you using SAN at present ?
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ThushyaAuthor Commented:
arunraju,
1. We are having 20 servers in site A and 3 in site B ( site A production and site B for DR ), also there are some configurations in each servers related to local ip address, need to an investigation to find all, each application may be related to 3 or 4 servers using ip address.
2. yes.
3. some custom web application linked to databases ( 3 sql and 2 oracle ) - databases are using linked servers using ip address and host names.
4. yes, but the sans are not linked between sites, they are limited to local site only, we do not have a high bandwidth.
thx
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bbnp2006Commented:
Since you have the routing setup between different subnets between site A and site B already, you just need to setup virtual networking configuration on site B (DR), so that when your protected site A fails over to the DR, you can still keep the same IP scheme for your site A, your router on site B should take care of the routing between 2 subnets as usual.

Food for thoughts.
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vmwarun - ArunCommented:
1.What is the distance between the 2 Sites and what is the link speed ?
2.Site Recovery Manger primarily syncs data from Primary Site to DR Site and I am not sure whether it allows two-way synching (PR -> DR and DR-> PR).
3.Which SAN are you using (FC or iSCSI) and who is the vendor ?
4.How much is your budget ?
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ThushyaAuthor Commented:
bbnp2006:
what about one or two servers failing over to site B ( not entire site ) ?

"you just need to setup virtual networking configuration on site B (DR)"
could you give me more information on this ?
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ThushyaAuthor Commented:
arunraju
site to site is about 20KM, bandwidth is around 300Mb plus a standby 2x 126Kbs isdn link ( not used but for emergency only ), san - iscsi equallogic.
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bbnp2006Commented:
Sure, when you configure your Protected site (A) and recover site (B), one of the step is to configure "resource mapping", under resource mapping one of the resource you can map from site A to site B is "VM network". If you don't want to change the IP scheme of your current settings, you need to setup 192.168.1.0/24 on your site B, so that you can map your protected VMs from your site A to this network when your protected VMs restarted on site B.

Does this help?
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ThushyaAuthor Commented:
bbnp2006,
Does this apply to single server failing over to DR site while site A and B are under function ?

I mean fail over ONE server (VM)  from site A to site B and make the failed-over server to start working from site B and  communicate with other servers in site A as well as serves in site B ?

thx
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bbnp2006Commented:
You will be setting up the networking as part of the whole recovery site configuration process anyways, you gonna need recovery network and testing network setup, one for real scenario recovery, another one for testing. which stage of the configuration are you at right now?
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vmwarun - ArunCommented:
SRM allows you to set this priority as to which VMs should come up first on the DR Site.
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bbnp2006Commented:
If you look at page 28 and on-wards in this documents:
http://www.vmware.com/files/pdf/vcenter-srm-evaluators-guide.pdf
It gives you details about how to customize IP information for each VM that you want to recover at the recovery site, this can help you if you want to change the VMs from site A to 192.168.2.0/24 ip range when they are recovered at site B.
 food for thought.
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ThushyaAuthor Commented:
bbnp2006,
it is giving change to customize the network ip / dns but i am worried about applications inside the recovered server which still pointing to site A ip address ? for example
server1 and server2 from site A filed over to site B.
now i have customized the server1 & 2 to work with site B ip address.

but the application inside ServerA would still look for ServerB in site A ipaddress - mean the hard corded ip inside the serverA application will not know the new change in ip address, i am tying to find a solution to this.
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bbnp2006Commented:
Ok, if that's the case, you have to configure both site to be the same IP subnet. My next question would be are you only interested in setting failover of one single VM from your primary site? Mind you, this application is for "site" recovery, normally for a set of VMs that you want to protect. Seems a bit over-kill for just one VM. Have you thought about using Fault Tolerance for your VM?
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ThushyaAuthor Commented:
bbnp2006
well - you spot on - i am planing to use FT and HA but still there is one thing i need to implement, put both sites visible each other (put both site on same sub-net) , this way i can forget about having to play with hard coded ip address etc...

Yes, SRM not a good option for my case ( entire site recovery not a priority for now), may be down the road.
anything you would like to advise on putting both on same sub-net ? ( traffic and collision etc)

thx
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bbnp2006Commented:
As long as a /24 subnet mask is enough for all your internal IP (254 IPs), you should be ok, but to think down the road when you need to expand your network, you probably want to change the subnet mask and give yourself more breath room so down the road, you don't have to expand your IP range. Kill 2 birds with one stone :)
I think all you need to modify is to change the firewall settings to route network traffic between both sites. Do you have users/servers accessing servers from both site A and site B? keep it in mind that you need to set routing rules a little bit differently if both sites using the same IP range. For example, server A1 in site A is 192.168.1.1 and server B1 in site B is now 192.168.1.2. when server A1 trying to access B1, your router on site A might think that all 192.168.1.0 are in site A and not route the traffic to site B. Just some twicking on your firewall/router should do the trick.
Hope this helps and good luck Thushya!
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ThushyaAuthor Commented:
Thank you bbnp2006 & Arunraju
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